What did you use to defrag it?
And yes, PD has a SSD optimize. No, it will not hurt the SSD.
It doesnt actually defrag, and move a lot of files.
Fragmentation does not affect a SSDs Read speed, this is quite true.
But, free space fragmentation can effect the write speeds.
Since a SSD must erase a block, before writing to it, this is why a defrag is a bad thing. Its causing alot of Erase/Write Cycles.
This in and of itself will not harm the SSD, its just using up the limited amount of writes the SSD is rated for faster, for no real improvements in return.
Rather than trying to explain it myself, heres Raxco's explination of how it works:
SSD Optimization - RAXCO Software